body{
    position: absolute;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background-color: #f5f5f5;
}

#correct{
    height: 100%;
}

header{
    height:80px;
    background-color: #1BBC9B;
    color: white;
}

header .container{
    width: 80%;
    position: relative;
    height:100%;
}

header .container>h1{
}

header .dropdown{
    position: absolute;
    right:0;
    top:50%;
    margin-top:-20px;
}

.dropdown .btn{
    background-color: transparent;
    border: none;
    font-size: 20px;
    color: white;
    text-decoration: none;
}

header .dropdown-menu li{
    height: 35px;
    font-size: 18px;
}

header i{
    vertical-align: middle;
    margin-right:5px;
}


/*main*/
main{
    height:calc(100% - 80px);
    position: relative;
}

main>.menu{
    position: relative;
    z-index:1;
    width: 200px;
    height:100%;
    background-color: #f5f5f5;
}

main>.content{
    position: absolute;
    top:0;
    right:0;
    width: 100%;
    height:100%;
    padding-left:200px;
    box-sizing: border-box;
    overflow: hidden;
    background-color: #fff;
}

main>.content .tab-content iframe{
    width: 100%;
    height:100%;
    border: none;
}

/*左侧菜单*/
.menu ul{
    list-style: none;
    padding: 0;
    border: none;
}

.menu ul li{
    float: none;
    margin:0;
    padding:0;
}

.menu ul li a{
    display: block;
    font-size: 20px;
    line-height: 60px;
    text-align: center;
    text-decoration: none;
    color: #888;
    border: none;
    margin:0;
}

.menu ul.nav li.active a,.menu ul.nav li a:hover{
    background-color: #fff;
    color: #333333;
    border: none;
}

.tab-content > div,.tab-content{
    width: 100%;
    height:100%;
    overflow: hidden;
}